EP4064595A1 - Gerät und verfahren zum senden und empfangen von daten und steuersignalen in einem kommunikationssystem - Google Patents

Gerät und verfahren zum senden und empfangen von daten und steuersignalen in einem kommunikationssystem Download PDF

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Publication number
EP4064595A1
EP4064595A1 EP20908359.1A EP20908359A EP4064595A1 EP 4064595 A1 EP4064595 A1 EP 4064595A1 EP 20908359 A EP20908359 A EP 20908359A EP 4064595 A1 EP4064595 A1 EP 4064595A1
Authority
EP
European Patent Office
Prior art keywords
layers
maximum number
parameter
tbs
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20908359.1A
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English (en)
French (fr)
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EP4064595A4 (de
Inventor
Seho Myung
Jeongho Yeo
Jonghyun BANG
Younsun Kim
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP4064595A1 publication Critical patent/EP4064595A1/de
Publication of EP4064595A4 publication Critical patent/EP4064595A4/de
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the disclosure generally relates to a communication system, and more particularly, to a method and apparatus for transmitting and receiving data and control information in a communication system.
  • a 5G communication system or a pre-5G communication system is referred to as a beyond 4G network communication system or a post long term evolution (LTE) system.
  • LTE post long term evolution
  • a mmWave band e.g., 60 GHz band.
  • MIMO massive multiple input and multiple output
  • FD-MIMO full dimensional MIMO
  • array antenna analog beamforming, and large scale antenna
  • cloud RAN cloud radio access network
  • D2D device to device communication
  • wireless backhaul moving network
  • cooperative communication coordinated multi-points (CoMP)
  • interference cancellation is being developed.
  • FQAM quadrature amplitude modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • the disclosure provides an apparatus and method for effectively determining the size of a transport block in a wireless or wired communication system.
  • the disclosure provides an apparatus and method for effectively determining the size of a code block in a wireless or wired communication system.
  • the disclosure provides an apparatus and method for effectively performing rate matching in a wireless or wired communication system.
  • the disclosure provides an apparatus and method for limiting transmittable parity bits in a wireless or wired communication system.
  • a method performed by a terminal of a communication system may include receiving, from a base station, information indicating limited buffer rate matching (LBRM); identifying a parameter related to the maximum number of layers for one transport block; identifying the maximum number of layers for the one transport block based on the parameter; identifying a transport block size (TBS) to which the LBRM is applied based on the determined maximum number of layers; and transmitting or receiving data to or from the base station based on the TBS, wherein the parameter may be identified based on at least one of a first maximum number of multiple-input-multiple-output (MIMO) layers configured to correspond to a serving cell or a second maximum number of MIMO layers configured to correspond to a bandwidth part (BWP).
  • MIMO multiple-input-multiple-output
  • BWP bandwidth part
  • the parameter may be identified as a maximum value of a maximum rank configured for each BWP of the serving cell
  • the parameter in case that the first maximum number of MIMO layers and the second maximum number of MIMO layers are not configured, and that a maximum rank is not configured for each BWP of the serving cell, the parameter may be identified as the maximum number of layers supported by the terminal for a channel through which the data is transmitted or received in the serving cell.
  • the maximum number of layers for one transport block may be identified as the same value as that of the parameter, and in case that the transport block is related to a downlink, the maximum number of layers for the one transport block may be identified to the smaller of the parameter and 4.
  • a method performed by a base station of a communication system may include transmitting, to a terminal, information indicating limited buffer rate matching (LBRM); identifying a parameter related to the maximum number of layers for one transport block; identifying the maximum number of layers for one transport block based on the parameter; identifying a transport block size (TBS) to which the LBRM is applied based on the determined maximum number of layers; and transmitting or receiving data to or from the terminal based on the TBS, wherein the parameter may be identified based on at least one of a first maximum number of multiple-input-multiple-output (MIMO) layers configured to correspond to a serving cell or a second maximum number of MIMO layers configured to correspond to a bandwidth part (BWP).
  • MIMO multiple-input-multiple-output
  • a terminal of a communication system may include a transceiver; and a controller configured to receive information indicating limited buffer rate matching (LBRM) from a base station, to identify a parameter related to the maximum number of layers for one transport block, to identify the maximum number of layers for one transport block based on the parameter, to identify a transport block size (TBS) to which the LBRM is applied based on the determined maximum number of layers, and to transmit or receive data to or from the base station based on the TBS, wherein the parameter may be identified based on at least one of a first maximum number of multiple-input-multiple-output (MIMO) layers configured to correspond to a serving cell or a second maximum number of MIMO layers configured to correspond to a bandwidth part (BWP).
  • MIMO multiple-input-multiple-output
  • a base station of a communication system may include a transceiver; and a controller configured to transmit information indicating limited buffer rate matching (LBRM) to a terminal, to identify a parameter related to the maximum number of layers for one transport block, to identify the maximum number of layers for one transport block based on the parameter, to identify a transport block size (TBS) to which the LBRM is applied based on the determined maximum number of layers, and to transmit or receive data to or from the terminal based on the TBS, wherein the parameter may be identified based on at least one of a first maximum number of multiple-input-multiple-output (MIMO) layers configured to correspond to a serving cell or a second maximum number of MIMO layers configured to correspond to a bandwidth part (BWP).
  • MIMO multiple-input-multiple-output
  • An apparatus and method according to various embodiments of the disclosure can effectively perform rate matching using limited parity bits.
  • the disclosure relates to an apparatus and method for transmitting and receiving data and control information in a wireless communication system. Specifically, the disclosure indicates information on the band set assumed by the base station to the terminal according to capability information of the terminal, and describes how the terminal uses configuration information from the base station to calculate transmission and reception parameters.
  • a term referring to a signal, a term referring to a channel, a term referring to control information, a term referring to network entities, and a term referring to components of devices used in the following description are exemplified for convenience of description. Accordingly, the disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used. For example, in the disclosure, a peak data rate and a max data rate may be used interchangeably.
  • a physical channel and a signal may be used interchangeably with data or a control signal.
  • a physical downlink shared channel (PDSCH) is a term referring to a physical channel through which data is transmitted, the PDSCH may be used for referring to data.
  • higher signaling refers to a method of transmitting a signal from a base station to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer.
  • Higher signaling may be understood as radio resource control (RRC) signaling or an MAC control element (CE).
  • RRC radio resource control
  • CE MAC control element
  • FIG. 1 is a diagram illustrating a wireless communication system according to various embodiments of the disclosure.
  • FIG. 1 illustrates a base station 110, a terminal 120, and a terminal 130 as some of nodes using a wireless channel in a wireless communication system.
  • FIG. 1 illustrates only one base station, but other base stations that are the same as or similar to the base station 110 may be further included.
  • the base station 110 is a network infrastructure that provides wireless access to the terminals 120 and 130.
  • the base station 110 has coverage defined as a predetermined geographic area based on a distance capable of transmitting a signal.
  • the base station 110 may be referred to as an 'access point (AP)', 'eNodeB (eNB)', '5th generation node (5G node)', 'next generation nodeB (gNB)', 'wireless point', 'transmission/reception point (TRP)', or other terms having an equivalent technical meaning.
  • Each of the terminal 120 and the terminal 130 is a device used by a user, and performs communication with the base station 110 through a wireless channel.
  • a link from the base station 110 to the terminal 120 or the terminal 130 is referred to as a downlink (DL), and a link from the terminal 120 or the terminal 130 to the base station 110 is referred to as an uplink (UL).
  • DL downlink
  • UL uplink
  • at least one of the terminal 120 or the terminal 130 may be operated without the user's involvement. That is, at least one of the terminal 120 or the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by the user.
  • MTC machine type communication
  • Each of the terminals 120 and 130 may be referred to as a 'user equipment (UE)', 'mobile station', 'subscriber station', 'remote terminal, 'wireless terminal', or 'user device' other than the terminal or other terms having an equivalent technical meaning.
  • UE 'user equipment
  • the base station 110, the terminal 120, and the terminal 130 may transmit and receive radio signals in mm Wave bands (e.g., 28 GHz, 30 GHz, 38 GHz, and 60 GHz).
  • the base station 110, the terminal 120, and the terminal 130 may perform beamforming.
  • beamforming may include transmission beamforming and reception beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may impart directivity to a transmission signal or a reception signal.
  • the base station 110 and the terminals 120 and 130 may select serving beams 112, 113, 121, and 131 through a beam search or beam management procedure. After the serving beams 112, 113, 121, and 131 are selected, subsequent communication may be performed through a resource in a quasi copositioned (QCL) relationship with the resource that has transmitted the serving beams 112, 113, 121, and 131.
  • QCL quasi copositioned
  • large-scale characteristics of a channel that has transmitted a symbol on a first antenna port may be inferred from a channel that has transmitted a symbol on a second antenna port, the first antenna port and the second antenna port may be evaluated to be in a QCL relationship.
  • large-scale characteristics may include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, or spatial receiver parameter.
  • FIG. 2 is a block diagram illustrating a configuration of a base station in a wireless communication system according to various embodiments of the disclosure.
  • the configuration illustrated in FIG. 2 may be understood as a configuration of the base station 110.
  • Terms such as '... unit', '... 'device' used hereinafter mean a unit that processes at least one function or operation, which may be implemented into hardware or software, or a combination of hardware and software.
  • the base station includes a RF unit 210, a backhaul communication unit 220, a storage 230, and a controller 240.
  • the RF unit 210 performs functions for transmitting and receiving signals through a wireless channel.
  • the RF unit 210 may perform a function of converting between a baseband signal and a bit string according to a physical layer standard of a system.
  • the RF unit 210 may encode and modulate the transmitted bit string to generate complex symbols.
  • the RF unit 210 may restore the received bit string through demodulation and decoding of the baseband signal.
  • the RF unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits the RF band signal through the antenna, and down-converts the RF band signal received through the antenna into a baseband signal.
  • the RF unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like.
  • the RF unit 210 may include a plurality of transmission and reception paths.
  • the RF unit 210 may include at least one antenna array configured with a plurality of antenna elements.
  • the RF unit 210 may be configured with a digital unit and an analog unit, and the analog unit may be configured with a plurality of sub-units according to operating power, operating frequency, and the like.
  • the digital unit may be implemented into at least one processor (e.g., digital signal processor (DSP)).
  • DSP digital signal processor
  • the RF unit 210 transmits and receives signals, as described above. Accordingly, all or part of the RF unit 210 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. Further, in the following description, transmission and reception performed through a wireless channel are used in the meaning including the processing being performed as described above by the RF unit 210.
  • the backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station to another node, for example, another access node, another base station, upper node, core network, and the like into a physical signal, and converts a physical signal received from the other node to a bit string.
  • the storage 230 stores data such as a basic program, an application program, and configuration information for the operation of the base station.
  • the storage 230 may be configured with a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. Further, the storage 230 provides stored data according to the request of the controller 240.
  • the controller 240 controls overall operations of the base station. For example, the controller 240 may transmit and receive a signal through the RF unit 210 or through the backhaul communication unit 220. Further, the controller 240 writes and reads data in the storage 230. Further, the controller 240 may perform functions of a protocol stack required by the communication standard. According to another implementation example, the protocol stack may be included in the RF unit 210. To this end, the controller 240 may include at least one processor. According to various embodiments, the controller 240 may control the base station to perform operations according to various embodiments to be described later.
  • FIG. 3 is a block diagram illustrating a configuration of a terminal in a wireless communication system according to various embodiments of the disclosure.
  • the configuration illustrated in FIG. 3 may be understood as a configuration of the terminal 120.
  • Terms such as '... unit', '... 'device' used hereinafter mean a unit that processes at least one function or operation, which may be implemented into hardware or software, or a combination of hardware and software.
  • the terminal includes a communication unit 310, a storage 320, and a controller 330.
  • the communication unit 310 performs functions for transmitting and receiving signals through a wireless channel.
  • the communication unit 310 may perform a function of converting between a baseband signal and a bit string according to a physical layer standard of a system.
  • the communication unit 310 may encode and modulate the transmitted bit string to generate complex symbols.
  • the communication unit 310 may demodulate and decode the baseband signal to restore the received bit string.
  • the communication unit 310 up-converts the baseband signal into an RF band signal, transmits the RF band signal through the antenna, and down-converts the RF band signal received through the antenna into a baseband signal.
  • the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.
  • the communication unit 310 may include a plurality of transmission and reception paths. Furthermore, the communication unit 310 may include at least one antenna array configured with a plurality of antenna elements. In terms of hardware, the communication unit 310 may be configured with a digital circuit and an analog circuit (e.g., radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented into one package. Further, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.
  • RFIC radio frequency integrated circuit
  • the communication unit 310 transmits and receives signals, as described above. Accordingly, all or part of the communication unit 310 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. Further, in the following description, transmission and reception performed through a wireless channel are used in the meaning including the processing being performed as described above by the communication unit 310.
  • the storage 320 stores data such as a basic program, an application program, and configuration information for the operation of the terminal.
  • the storage 320 may be configured with a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. Further, the storage 320 provides the stored data according to the request of the controller 330.
  • the controller 330 controls overall operations of the terminal. For example, the controller 330 may transmit and receive a signal through the communication unit 310. Further, the controller 330 writes and reads data in the storage 320. Further, the controller 330 may perform functions of a protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or microprocessor or may be a part of the processor. Further, a part of the communication unit 310 and the controller 330 may be referred to as a communication processor (CP). According to various embodiments, the controller 330 may control the terminal to perform operations according to various embodiments to be described later.
  • CP communication processor
  • FIG. 4 is a block diagram illustrating a configuration of a communication unit in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 4 illustrates an example of a detailed configuration of the RF unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 . Specifically, FIG. 4 illustrates components for performing beamforming as a part of the RF unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 .
  • the RF unit 210 or the communication unit 310 includes an encoding and modulation unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 to 406-N, and an analog beamforming unit 408.
  • the encoding and modulation unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, or a polar code may be used.
  • LDPC low density parity check
  • the encoding and modulation unit 402 performs constellation mapping to generate modulation symbols.
  • the digital beamforming unit 404 performs beamforming on a digital signal (e.g., modulation symbols). To this end, the digital beamforming unit 404 multiplies modulation symbols by beamforming weights.
  • the beamforming weights are used for changing the magnitude and phase of a signal, and may be referred to as a 'precoding matrix', a 'precoder', or the like.
  • the digital beamforming unit 404 outputs digital beamformed modulation symbols to a plurality of transmission paths 406-1 to 406-N.
  • modulation symbols may be multiplexed or the same modulation symbols may be provided to the plurality of transmission paths 406-1 to 406-N.
  • the plurality of transmission paths 406-1 to 406-N convert digital beamformed digital signals into analog signals.
  • each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast Fourier transform (IFFT) operation unit, a cyclic prefix (CP) insertion unit, a DAC, and an upconversion unit.
  • the CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) method, and may be excluded in case that another physical layer method (e.g., filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406-1 to 406-N provide independent signal processing processes for a plurality of streams generated through digital beamforming. However, according to an implementation method, some of components of the plurality of transmission paths 406-1 to 406-N may be used in common.
  • the analog beamforming unit 408 performs beamforming on an analog signal. To this end, the digital beamforming unit 404 multiplies the analog signals by beamforming weights. Here, the beamforming weights are used for changing the magnitude and phase of the signal.
  • the analog beamforming unit 408 may be variously configured according to a connection structure between the plurality of transmission paths 406-1 to 406-N and antennas. For example, each of the plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. As another example, the plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. As another example, the plurality of transmission paths 406-1 to 406-N may be adaptively connected to one antenna array or two or more antenna arrays.
  • the communication system is evolving from providing an initial voice-oriented service to a broadband wireless communication system that provides high-speed and high-quality packet data services as in communication standards such as high speed packet access (HSPA), long term evolution (LTE), or evolved universal terrestrial radio access (E-UTRA) of 3GPP, LTE-A (advanced), high rate packet data (HRPD), ultra mobile broadband (UMB) of 3GPP2, and 802.16e of IEEE.
  • HSPA high speed packet access
  • LTE long term evolution
  • E-UTRA evolved universal terrestrial radio access
  • LTE-A advanced
  • HRPD high rate packet data
  • UMB ultra mobile broadband
  • 802.16e 802.16e of IEEE.
  • 5G wireless communication system a communication standard of 5G or NR (new radio) is being made.
  • the NR system employs an orthogonal frequency division multiplexing (OFDM) scheme in a downlink (DL) and uplink. More specifically, a cyclic-prefix OFDM (CP-OFDM) scheme in a downlink and a discrete Fourier transform spreading OFDM (DFT-S-OFDM) scheme along with CP-OFDM in an uplink are employed.
  • the uplink refers to a radio link through which the terminal transmits data or control signals to the base station
  • the downlink refers to a radio link through which the base station transmits data or control signals to the terminal.
  • the multiple access method divides data or control information of each user by allocating and operating time-frequency resources in which data or control information is to be in general transmitted for each user so that they do not overlap each other, that is, orthogonality is established.
  • the NR system employs a hybrid automatic repeat request (HARQ) scheme of retransmitting corresponding data in the physical layer in case that a decoding failure occurs in initial transmission.
  • HARQ hybrid automatic repeat request
  • the receiver transmits a negative acknowledgment (NACK), which is information notifying the transmitter of a decoding failure, so that the transmitter may retransmit the corresponding data in the physical layer.
  • NACK negative acknowledgment
  • the receiver may improve a data reception performance.
  • ACK acknowledgment
  • the receiver may enable the transmitter to transmit new data.
  • FIG. 5 is a diagram illustrating a resource structure in a time-frequency domain in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 5 illustrates a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in downlink or uplink.
  • a horizontal axis represents a time domain
  • a vertical axis represents a frequency domain
  • a minimum transmission unit in the time domain is an OFDM symbol, and the N symb number of OFDM symbols 502 are gathered to constitute one slot 506.
  • a length of a subframe is defined to 1.0ms
  • a length of a radio frame 514 is defined to 10ms.
  • a minimum transmission unit in the frequency domain is a subcarrier, and a bandwidth of the entire system transmission band is configured with total N BW number of subcarriers 504.
  • a basic unit of a resource in the time-frequency domain is a resource element (RE) 512, which may be represented by an OFDM symbol index and a subcarrier index.
  • a resource block (RB or physical resource block (PRB)) 508 is defined to the N symb number of consecutive OFDM symbols 502 in the time domain and the N RB number of consecutive subcarriers 510 in the frequency domain. Accordingly, one RB 508 includes the N symb ⁇ N RB number of REs 512.
  • a minimum transmission unit of data is an RB.
  • N symb 14
  • N RB 12
  • N BW and N RB are proportional to the bandwidth of the system transmission band.
  • a data rate may increase in proportion to the number of RBs scheduled to the terminal.
  • a downlink transmission bandwidth and an uplink transmission bandwidth may be different from each other.
  • the channel bandwidth represents a radio frequency (RF) bandwidth corresponding to the system transmission bandwidth.
  • [Table 1] and [Table 2] represent a part of the corresponding relation between a system transmission bandwidth, subcarrier spacing (SCS), and a channel bandwidth defined in the NR system in frequency bands lower than 6 GHz and higher than 6 GHz. For example, a transmission bandwidth of an NR system having a 100 MHz channel bandwidth with 30 kHz subcarrier spacing is configured with 273 RBs.
  • N/A may be a bandwidth-subcarrier combination not supported by the NR system.
  • DCI downlink control information
  • DCI format 1-1 which is scheduling control information on downlink data, may include at least one of items illustrated in Table 3. [Table 3] Item Contents Carrier indicator Indicate in which frequency carrier it is transmitted.
  • DCI format indicator Indicator for distinguishing whether the corresponding DCI is for downlink or uplink.
  • Bandwidth part (BWP) indicator Indicate in which BWP it is transmitted.
  • Frequency domain resource allocation Indicate an RB in a frequency domain allocated for data transmission. A resource to be expressed is determined according to a system bandwidth and resource allocation method.
  • Time domain resource allocation Indicate in which OFDM symbol of which slot a data related channel is to be transmitted.
  • VRB-to-PRB mapping Indicate a method of mapping a virtual RB (VRB) index and a physical RB (PRB) index.
  • Modulation and coding scheme (MCS) Indicate a modulation method and a code rate used for data transmission.
  • HARQ process number Indicate the process number of HARQ New data indicator (NDI) Indicate whether the HARQ is initial transmission or retransmission.
  • Redundancy version Indicate a redundancy version of HARQ.
  • TPC transmit power control command
  • PUCCH physical uplink control channel
  • time domain resource assignment may be represented by information on a slot in which the PDSCH is transmitted, a start symbol position S in the slot, and the number L of symbols to which the PDSCH is mapped.
  • S may be a relative position from the start of the slot
  • L may be the number of consecutive symbols
  • S and L may be determined from start and length indicator values (SLIV) defined as in [Table 4].
  • SLIV start and length indicator values
  • information on the corresponding relation between the SLIV value and the PDSCH or physical uplink shared channel (PUSCH) mapping type and information on the slot in which the PDSCH or PUSCH is transmitted may be configured in one row through the RRC configuration. Thereafter, by indicating an index value defined in the configured corresponding relation using time domain resource allocation of DCI, the base station may transfer, to the terminal, information on the slot in which the SLIV value, the PDSCH or PUSCH mapping type, and the PDSCH or PUSCH are transmitted.
  • the PDSCH or PUSCH mapping type is defined to a type A and a type B.
  • a demodulation reference signal (DMRS) symbol starts from the second or third OFDM symbol in the slot.
  • a DMRS symbol starts from the first OFDM symbol of a time domain resource allocated for PUSCH transmission.
  • [Table 5] and [Table 6] illustrate combinations of S and L supported for each type of the PDSCH and the PUSCH.
  • DCI may be transmitted in a physical downlink control channel (PDCCH), which is a downlink control channel through channel coding and modulation.
  • PDCCH physical downlink control channel
  • the PDCCH may be used for referring to control information itself rather than a channel.
  • DCI is independently scrambled with a specific radio network temporary identifier (RNTI) or terminal identifier for each terminal, is configured with an independent PDCCH after addition of a cyclic redundancy check (CRC) and channel coding, and is transmitted.
  • RNTI radio network temporary identifier
  • CRC cyclic redundancy check
  • the PDCCH is mapped to a control resource set (CORESET) configured to the terminal.
  • CORESET control resource set
  • Downlink data may be transmitted in PDSCH, which is a physical channel for downlink data transmission.
  • the PDSCH may be transmitted after a control channel transmission period, and scheduling information such as a specific mapping position and a modulation method in the frequency domain is indicated by DCI transmitted through the PDCCH.
  • the base station notifies the terminal of a modulation scheme applied to the PDSCH to be transmitted and a size of data (e.g., transport block size (TBS)) to be transmitted through the MCS among control information constituting DCI.
  • TBS transport block size
  • the MCS may be configured with 5 bits or more or fewer bits.
  • the TBS corresponds to a size before channel coding for error correction is applied to a transport block (TB), which is data in which the base station wants to transmit.
  • a transport block may include a medium access control (MAC) header, a MAC control element (CE), one or more MAC service data unit (SDU), and padding bits.
  • the TB may indicate a data unit or MAC protocol data unit (PDU) sent down from the MAC layer to the physical layer.
  • MAC medium access control
  • CE MAC control element
  • SDU MAC service data unit
  • PDU MAC protocol data unit
  • Modulation schemes supported by the NR system are quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM, and 256 QAM, and each modulation order (Qm) may be 2, 4, 6, or 8. That is, 2 bits per symbol for QPSK, 4 bits per symbol for 16 QAM, 6 bits per symbol for 64 QAM, and 8 bits per symbol for 256 QAM may be transmitted.
  • QPSK quadrature phase shift keying
  • QAM 16 quadrature amplitude modulation
  • Qm modulation order
  • Qm modulation order
  • the NR system is designed to allow various services to be multiplexed freely in time and frequency resources, and accordingly, waveform/numerology, reference signals, and the like may be adjusted freely or dynamically, as needed.
  • optimized data transmission through measurement of a channel quality and interference amount is important, and accordingly, accurate channel state measurement is essential.
  • FSG frequency resource group
  • the NR system may divide types of supported services into an enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultrareliable and low-latency communications (URLLC).
  • eMBB is a service that aims at high-speed transmission of high-capacity data
  • mMTC massive machine type communications
  • URLLC is a service that aims at high reliability and low latency.
  • Different requirements may be applied according to the type of service applied to the terminal. Examples of resource distribution of each service are illustrated in FIGS. 6A and 6B .
  • FIGS. 6A and 6B there is identified a method in which frequency and time resources are allocated for information transmission in each system.
  • FIG. 6A is a diagram illustrating an example of allocation of data for each service to a frequency-time resource in a wireless communication system according to various embodiments of the disclosure.
  • resources are allocated for an eMBB 622, URLLC 612, 614, and 616, and mMTC 632 in an entire system frequency band 610.
  • URLLC 612, 614, and 616 data is generated while eMBB 622 data and mMTC 632 data are allocated and transmitted in a specific frequency band
  • URLLC 612, 614, and 616 data may be transmitted without transmitting or emptying a part already allocated for the eMBB 622 and the mMTC 632. Because the URLLC requires a reduction in delay time, a resource for transmitting the URLLC 612, 614, and 616 data may be allocated to a part of the resource allocated to the eMBB 622.
  • the eMBB 622 data may not be transmitted in the overlapping frequency-time resource; thus, a transmission performance of the eMBB 622 data may be lowered. That is, in the above case, a transmission failure of the eMBB 622 data may occur due to allocation of resources for the URLLC 612, 614, and 616.
  • the method illustrated in FIG. 6A may be referred to as a preemption method.
  • FIG. 6B is a diagram illustrating another example of allocating data for each service to a frequency-time resource in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 6B illustrates an example in which each service is provided in each of subbands 662, 664, and 666 in which an entire system frequency band 660 is divided.
  • the subband 662 is used for data transmission of URLLC 672, 674, and 576
  • the subband 664 is used for data transmission of an eMBB 682
  • the subband 666 is used for data transmission of mMTC 692.
  • Information related to a configuration of the subbands 662, 664, and 666 may be predetermined, and the information may be transmitted from the base station to the terminal through higher signaling.
  • information related to the subbands 662, 664, and 666 may be arbitrarily divided by a base station or a network node, and provide services without transmission of separate subband configuration information to the terminal.
  • a length of a transmission time interval (TTI) used for URLLC transmission may be shorter than that of a TTI used for eMBB or mMTC transmission.
  • a response of URLLC-related information may be transmitted faster than eMBB or mMTC, and accordingly, a terminal using the URLLC service can transmit and receive information with low delay.
  • Structures of a physical layer channel used for each type so as to transmit the above three services or data may be different from each other. For example, at least one of a length of a TTI, an allocation unit of a frequency resource, a structure of a control channel, or a data mapping method may be different from each other.
  • FIG. 7 is a diagram illustrating a data encoding method in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 7 illustrates that one TB is segmented into several code blocks (CBs) and that a CRC is added.
  • CBs code blocks
  • a CRC 714 may be added to the rear end or front end of one TB 712 to be transmitted in uplink or downlink.
  • the CRC 714 may have a 16-bit or 24-bit, or a pre-fixed number of bits, or a variable number of bits according to channel conditions, and be used in the receiver so as to determine whether channel coding is successful.
  • a block to which the TB 712 and the CRC 714 are added is segmented into a plurality of CBs 722-1, 722-2, 722-(N-1) and 722-N.
  • the block may be segmented into a predefined size of CB, and in this case, the last CB 722-N is smaller in size than the other CBs, or may be configured to have the same length as that of other CBs by adding 0, a random value, or 1.
  • CRCs 732-1, 732-2, 732-(N-1), and 732-N may be added to each of the segmented CBs.
  • the CRCs 732-1, 732-2, 732-(N-1), and 732-N may have 16 bits, 24 bits, or a pre-fixed number of bits and be used for determining the success or failure of channel coding at the receiver.
  • the TB 712 and a cyclic generator polynomial may be used for generating the CRC 714.
  • the CRC length L is 24, but the length L
  • the sum of the TB and the CRC is segmented into the N number of CBs 722-1, 722-2, 722-(N-1), and 722-N.
  • the CRCs 732-1, 732-2, 732-(N-1), and 732-N are added to the CBs 722-1, 722-2, and 722-(N-1), and 722-N, respectively.
  • the CRC added to each CB may be generated based on a CRC of a different length or a different cyclic generator polynomial from that when generating the CRC added to the TB.
  • the CRC 714 added to the TB and the CRCs 732-1, 732-2, 732-(N-1), and 732-N added to the CBs 722-1, 722-2, 722-(N-1), and 722-N may be omitted according to the type of channel code to be applied to the CB.
  • LDPC low density parity code
  • CRCs 732-1, 732-2, 732-(N-1), and 732-N added to each CB may be omitted.
  • the CRCs 732-1, 732-2, 732-(N-1), and 732-N may be added to the CBs 732-1, 732-2, 732-(N-1), 732-N. Further, even in case that a polar code is used, the CRC may be added or omitted.
  • a maximum length of one CB is determined according to the type of channel coding applied to the TB, and the TB and the CRC added to the TB are segmented into CBs according to the maximum length of the CB.
  • a CRC for the CB is added to the segmented CB, data bits and the CRC of the CB are encoded into a channel code; thus, coded bits are determined, and for each coded bits, the number of rate-matched bits is determined as promised in advance.
  • FIG. 8 is a diagram illustrating an example of using an outer code in a wireless communication system according to various embodiments of the disclosure.
  • CBs codeblocks
  • bits or symbols 802 at the same position in each CB are encoded using a second channel code. Accordingly, parity bits or symbols 804 are generated. Thereafter, CRCs 806 and 806 may be added to the CBs and parity CBs, respectively generated by second channel code encoding.
  • Whether to add the CRCs 806 and 808 may vary according to the type of the channel code.
  • the turbo code is used as a first channel code
  • CRCs 806 and 808 may be added.
  • the first channel code a convolutional code, an LDPC code, a turbo code, a polar code, and the like may be used.
  • the second channel code for example, a reed-solomon code, a BCH code, a raptor code, a parity bit generation code, and the like may be used.
  • FIGS. 9A and 9B are block diagrams illustrating configurations of a transmitter and a receiver using an outer code in a wireless communication system according to various embodiments of the disclosure.
  • a first channel code encoder 912 and a first channel code decoder 922 are included in the transmitter and the receiver, respectively, and a second channel code encoder 914 and a second channel code decoder 924 may not be included in the transmitter and the receiver.
  • the first channel code encoder 912 and the first channel code decoder 922 may be configured in the same way as a case that an outer code to be described later is used.
  • data to be transmitted may pass through the second channel code encoder 914.
  • Bits or symbols that have passed through the second channel code encoder 914 may pass through the first channel code encoder 912.
  • the receiver may perform a decoding operation sequentially using the first channel code decoder 922 and the second channel code decoder 924 based on the received signal.
  • the first channel code decoder 922 and the second channel code decoder 924 may perform operations corresponding to the first channel code encoder 912 and the second channel code encoder 914, respectively.
  • FIG. 10 is a diagram illustrating an example of a process in which one TB is encoded in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 10 illustrates a process of generating one or more parity CBs by applying a second channel code or an outer code to a plurality of TBs segmented from one TB.
  • the one TB 1012 may be segmented into at least one CB or a plurality of CBs 1022-1 to 1022-N.
  • the CRC may not be added to the corresponding CB.
  • an outer code is applied to the plurality of CBs 1022-1 to 1022-N
  • parity CBs (PCBs) 1024-1 to 1024-M may be generated.
  • the parity CBs 1024-1 to 1024-M may be positioned after the last CB 1022-N.
  • CRCs 1032-1 to 1032-(N+M) may be added. Thereafter, the CBs and the parity CBs may be encoded according to the channel code along with the CRC.
  • a size of a TB may be calculated through the following steps.
  • each calculation step is specifically described for the PDSCH, but the case of the PUSCH may be similarly applied.
  • each parameter necessary for determining a TBS or N RE for the PUSCH may be configured based on the number of OFDM symbols allocated to the PUSCH, the DM-RS type, and overhead values configured per RB/PRB.
  • Step 1 Calculate the number N RE of REs allocated to PDSCH mapping in one PRB in the allocated resource.
  • N sc RB denotes the number (e.g., 12) of subcarriers included in one RB
  • N symb sh denotes the number of OFDM symbols allocated to the PDSCH
  • N DMRS PRB denotes the number of REs in one PRB occupied by a demodulation reference signal (DMRS) of the same code division multiplexing (CDM) group
  • N oh PRB denotes the number (e.g., configured to one of 0, 6, 12, and 18) of REs occupied by an overhead in one PRB configured by higher signaling.
  • the total number N RE of REs allocated to the PDSCH may be calculated.
  • n PRB denotes the number of PRBs allocated to the terminal.
  • R denotes a code rate
  • Qm denotes a modulation order
  • v denotes the number of allocated layers.
  • the code rate and the modulation order may be transferred using an MCS field included in the control information and a predefined corresponding relation. If N info ⁇ 3824, the TBS may be calculated according to step 3, otherwise (i.e., N info >3824), the TBS may be calculated according to step 4.
  • an accurate TBS may be determined using a specific calculation and the TBS table of Table 7 according to a range of N info . That is, in order to perform the [TBS determination method 1], the TBS table of Table 7 should be stored in the terminal or the base station.
  • N info ′ > 8424 may be changed as in N info ′ > 8192 or N info ′ ⁇ 8448 .
  • it may be expressed as in N info ⁇ 8344 based on N info .
  • ⁇ N info ′ + 24 8 ⁇ C ⁇ , ⁇ N info ′ + 24 3816 ⁇ , ⁇ N info ′ + 24 8424 ⁇ , and the like may be expressed more simply using the result of calculating in common N info 8 , N info ′ 8 , or N info ′ + 24 8 .
  • N info " N info ′ + 24 8
  • ⁇ N info ′ + 24 8 ⁇ C ⁇ ⁇ N info " C ⁇
  • N info ′ + 24 is always a multiple of 8 and 1/8 is 2 -3 , it may be easily implemented as a bit-shift operation for integers.
  • An embodiment of the disclosure reduces a size of the TBS table required to determine the TBS, and instead proposes an efficient method for determining the TBS through a simple calculation.
  • the TBS may be calculated through the following steps.
  • Step 1 the same as step 1 of [TBS Determination Method 1]
  • a R is a value defined as R ⁇ 1024 in the MCS index table illustrated in Table 9, and means a numerator value when a target code rate is expressed as A R /1024, and may be known when the MCS-related signaling field I MCS is received. If X ⁇ 478, the TBS is determined using step 3, otherwise the TBS is determined using step 4.
  • Step 3 If X ⁇ 478, the TBS is determined as follows.
  • Y is determined to the nearest number not less than (i.e., greater than or equal to) 2 n ⁇ ⁇ X 2 n ⁇ using Table 10.
  • n ⁇ log 2 (X) ⁇ -6.
  • [Table 10] 101 149 201 277 357 106 153 209 285 372 111 157 217 301 388 116 161 225 309 405 123 165 233 317 421 129 169 241 325 437 133 177 253 333 453 141 185 261 341 469 145 193 269 349 478
  • the temporary intermediate number X was first determined based on the total number N RE of REs allocated to the PDSCH, the modulation order Q m , the number ⁇ of allocated layers, and the value A R related to the code rate.
  • the X value is first compared with a first reference value (e.g., 478), and in case that the X value is less than or equal to the first reference value, the X value is again compared with a second reference value (e.g., 96) as in step 3, and in case that the X value is less than or equal to (or less than) the second reference value, a predetermined calculation rule is applied to the X value to determine the TBS value through calculation, and in case that the X value is greater than (or equal to or greater than) the second reference value, the TBS value may be determined by applying the table of Table 10 and a predetermined rule.
  • Table 10 has about half the size of the TBS table of Table 7, it is not necessary for the terminal or the base station to store all values corresponding to the TBS.
  • the TBS may be determined using another calculation formula as in step 4.
  • a condition A R ⁇ 251 for determining a value of C corresponding to the number of code blocks may be modified as in the condition R ⁇ 1/4 or R ⁇ 251/1024 related to the code rate as in [TBS Determination Method 1], and the condition Y >1053 may be changed to Y >1024 or Y ⁇ 1056, or the condition may be expressed based on X as in X ⁇ 1043.
  • a criterion may be configured by selecting an appropriate value A R from the MCS table.
  • 251/1024 is a number smaller than 1/4 because it is about 0.245, but in the MCS table defined in 5G NR, it was configured to 251, which is a largest value among A R values corresponding to a code rate less than or equal to 1/4. In case that a A R value corresponding to a reference code rate value is different according to the system, the reference A R value may be changed.
  • N info N RE ⁇ Q m ⁇ R ⁇ ⁇
  • step 3 may be modified as follows.
  • Step 3 in case that N info ⁇ 3824, the TBS is determined as follows.
  • n ⁇ log 2 ( N info ) ⁇ -6.
  • the TBS determination method in case of converting N info or X to an integer and applying the calculation using a floor function, a ceiling function, or a round function, the calculation complexity may be further lowered.
  • N RE ⁇ Q m ⁇ ⁇ ⁇ R or N RE ⁇ Q m ⁇ ⁇ ⁇ R ⁇ 2 -3 value it is first compared with a first reference value (e.g., 3824 or 478), and then a method for determining the TBS is first determined.
  • a first reference value e.g. 3824 or 478
  • the TBS value is determined using a method of converting the N RE ⁇ Q m ⁇ ⁇ ⁇ R or N RE ⁇ Q m ⁇ ⁇ ⁇ R ⁇ 2 -3 value to an integer by applying a floor function, a ceiling function, or a round function to the N RE ⁇ Q m ⁇ ⁇ ⁇ R or N RE ⁇ Q m ⁇ ⁇ ⁇ R ⁇ 2 -3 value and then determining the determined or selected TBS based on the value converted to an integer.
  • various methods as well as the specific calculation method included in the [TBS determination method 1] and [TBS determination method 2] may be applied. The method may be simply expressed as in the following [TBS determination method 3].
  • Step 1 the same as step 1 of [TBS Determination Method 1]
  • N info_temp ⁇ 3824 (or X temp ⁇ 478 )
  • a TBS value is determined based on step 3
  • N info_temp >3824 (or X temp >478)
  • Steps 3 and 4 the same as each step of [TBS determination method 1] or [TBS determination method 2]
  • the disclosure proposed a method of simplifying and minimizing the operation in a calculation process and using ⁇ N RE ⁇ Q m ⁇ R ⁇ ⁇ ⁇ or ⁇ N RE ⁇ Q m ⁇ ⁇ ⁇ A R ⁇ 2 -13 ⁇ in the calculation process in order to determine the TBS by using a small table as illustrated in Table 10 instead of the TBS table illustrated in Table 7.
  • the values of N RE , Q m , ⁇ are all positive integers, and there is an advantage that the operation of 2 ⁇ ( integer ) may be easily implemented as a general bit-shift operation.
  • step 3 or less of the above [TBS determination method 1] and [TBS determination method 3] i.e., after a specific method for TBS determination is determined
  • N info S ⁇ N RE ⁇ R ⁇ Q m ⁇ ⁇ ).
  • S has values such as 1, 0.5, and 0.25, and N info is still a positive rational value.
  • the scaling factor S may be determined by a TB scaling field value in DCI, as illustrated in Table 12. The operation of multiplying the scaling factor may be easily implemented by more performing the bit shift by S times in the process of determining X. [Table 12] TB scaling field Scaling factor S 00 0 01 1 10 2 11
  • the NDI or HARQ process ID signaled on the PDCCH and the TBS determined as above are reported to the upper layer.
  • N info ⁇ N RE ⁇ Q m ⁇ ⁇ ⁇ R ⁇
  • N info ⁇ N RE ⁇ Q m ⁇ ⁇ ⁇ R ⁇
  • X ⁇ N RE ⁇ Q m ⁇ ⁇ ⁇ A R ⁇ 2 -13 ⁇
  • X ⁇ N RE ⁇ Q m ⁇ ⁇ ⁇ A R ⁇ 2 -13 ⁇ as an intermediate number without introducing a temporary intermediate number
  • spectral efficiency values corresponding to the modulation order and the code rate and the product of the modulation order and the code rate are indicated for each index. Therefore, in case that a value corresponding to the product of the modulation order and the code rate is required in the system, a spectral efficiency value may be used.
  • the spectral efficiency value included in the MCS index table is an approximate value, it may be slightly different from the actual value; thus, in some cases, in case that an accurate spectral efficiency value is required (e.g., a process of determining a TBS), it may be preferable to obtain the value by directly multiplying the modulation order and the code rate value rather than using the spectral efficiency value of the MCS table as it is.
  • the Q m ⁇ R value may be easily determined according to the MCS index table.
  • 3824 is a number that may be expressed as a product of 16 and 239, and 239 is a prime number.
  • the N ′ RE value should have one of 16, 32, 64, and 128.
  • N RE ′ N sc RB ⁇ N symb sh ⁇ N DMRS PRB ⁇ N oh PRB .
  • N sc RB is the number (e.g., 12) of subcarriers included in one RB
  • N oh PRB is the number (e.g., configure to one of 0, 6, 12, and 18) of REs occupied by an overhead in one PRB configured by higher signaling (e.g., xOverhead in PDSCH-ServingCellConfig or xOverhead in PUSCH-ServingCellConfig); thus, it can be seen that the N sc RB ⁇ N symb sh ⁇ N oh PRB value is always a multiple of 6. Therefore, in specific circumstances, the N' RE value may not be 16, 32, 64, or 128 according to the N DMRS PRB value.
  • N ′ RE cannot be an exponential number of 2 such as 16, 32, 64, or 128.
  • the N ′ RE ⁇ v ⁇ Q m ⁇ R value cannot be accurately 3824 in a system in which the N ′ RE value is not configured to a value such as 16, 32, 64, and 128. That is, because only rational numbers less than or greater than 3824 are possible as the N RE ⁇ v ⁇ Q m ⁇ R value, the criteria for determining step 3 or step 4 in [TBS determination method 1] to [TBS determination method 3] may be converted and used as follows.
  • N info ⁇ 3824 (or X ⁇ 478) a TBS value is determined based on step 3 and if N info ⁇ 3824 (or X ⁇ 478), a TBS value is determined based on step 4.
  • the TBS may be determined simply by integerizing the necessary parameters in each calculation process by applying the above [another embodiment of modification of step 2 in the TBS determination method].
  • the combination of the modulation order and the code rate may be indicated through the MCS table and MCS index configuration.
  • a method of determining different TBSs according to the MCS table configured in the system may be applied.
  • the MCS table not including the modulation order or code rate combination is configured (e.g., MCS table 1 or 2 for PDSCH, MCS table 1 for PUSCH), in the [TBS determination method 1] to [TBS determination Method 3] or a method similar thereto, by applying the above [another embodiment of modification of step 2 in the TBS determination method], a method of determining the TBS by integerizing parameters required in each calculation process may be applied.
  • a different TBS determination method may be applied according to whether an instruction related to a target service or transport block error rate of the system or a corresponding MCS table configuration.
  • a different TBS determination method may be applied according to whether an instruction related to a configuration for the CQI index table.
  • N info [ N RE ⁇ Q m ⁇ R ⁇ v ]
  • compatibility with the 5G NR system corresponding to the current 3GPP release-15 may not be maintained.
  • the TBS value is defined differently from the case of configuring the intermediate number to an integer value by applying first to the floor function.
  • the first communication system and the second communication system may be implemented together in a device such as a single communication chip, module, or terminal, and in such a case, the device is characterized in that it includes a process of determining which standard is followed, and then determining differently the TBS according to a range of N RE ⁇ Q m ⁇ R ⁇ v values based on the N RE ,Q m ,R,v value. That is, there is at least one case in which the TBS is determined differently for the same N RE ⁇ Q m ⁇ R ⁇ v value.
  • such a method has an advantage in that the intermediate number may be simply determined as an integer type, and that most TBS calculation formulas are also made in an integer type; thus, the operation becomes simpler.
  • the first communication system and the second communication system may be implemented together in a device such as a single communication chip, module, or terminal, and in this case, the device is characterized in that it includes a process in which the TBS is determined differently according to a range of S ⁇ N RE ⁇ Q m ⁇ R ⁇ v value based on the S,N RE ,Q m ,R,v value after determining which standard is followed. That is, there is at least one case in which the TBS is determined differently for the same S ⁇ N RE ⁇ Q m ⁇ R ⁇ v value.
  • a simple TBS determination method may be applied using a Schilling function or a rounding function.
  • caution is required because these methods may not be compatible with the existing 5G NR system conforming to 3GPP Release-15. (There is at least one case where the TBS is determined differently for the same N RE ⁇ R ⁇ Q m ⁇ v value or S ⁇ N RE ⁇ R ⁇ Q m ⁇ v value)
  • an appropriate code block is configured according to the TBS value determined in this way, and LDPC encoding is performed for each code block.
  • a process of determining the code block size (CBS) is as follows.
  • K cb 8448
  • K cb 3840.
  • Step 1 Determine the number C of code blocks.
  • K which is the number of bits included in each code block, is calculated as follows:
  • Step 3 Among Z values in Table 13, the minimum value Z c satisfying K b ⁇ Z ⁇ K ' is determined.
  • K 22 Z c
  • K 10 Z c .
  • shortening or zero padding may actually allocate a bit value promised by the transmitter and the receiver, such as 0, or may mean not using a corresponding part in the parity check matrix.
  • Table 13 illustrates candidates of lifting sizes for LDPC encoding and decoding
  • lifting refers to a technique used for designing or converting a quasi-cyclic LDPC code, and in particular, it refers to a method of supporting LDPC codes of various lengths by converting a following sequence by applying an operation (e.g., modulo or flooring operation) corresponding to a lifting size to a given sequence corresponding to the parity check matrix of the LDPC code.
  • One number included in the sequence of the LDPC code may be a value corresponding to a circulant permutation matrix (or expressed as a circular permutation matrix, or the like).
  • step 3 of the [CBS determination method 1] a process of determining a Z c value by selecting a minimum value satisfying a given condition among Z values of the lifting size based on Table 13 is required. Further, because a set index to which the determined lifting size belongs indicates the parity check matrix of the LDPC code to which the LDPC encoding is to be applied to the code block, the terminal or the base station performs LDPC encoding or decoding based on the parity check matrix of the LDPC code corresponding to the set index to which the determined lifting size belongs. Therefore, in order to perform the [CBS determination method 1], the lifting size table of Table 13 should be stored in the terminal or the base station.
  • a Zc value may be finally determined using Table 13 including candidate values of a lifting size Z, and the LDPC parity check matrix may be determined accordingly.
  • a lifting size candidate set as illustrated in Table 14 may be used.
  • Set index ( i LS ) Set of lifting sizes ( Z ) 0 ⁇ 8, 16, 32, 64, 128, 256 ⁇ 1 ⁇ 12, 24, 48, 96, 192, 384 ⁇ 2 ⁇ 10, 20, 40, 80, 160, 320 ⁇ 3 ⁇ 7, 14, 28, 56, 112, 224 ⁇ 4 ⁇ 18, 36, 72, 144, 288 ⁇ 5 ⁇ 11, 22, 44, 88, 176, 352 ⁇ 6 ⁇ 26, 52, 104, 208 ⁇ 7 ⁇ 15, 30, 60, 120, 240 ⁇
  • parity bits may be added and output.
  • the size of the parity bit may vary according to the LDPC base graph.
  • all parity bits generated by LDPC coding may be transmittable or only some of the parity bits may be transmittable.
  • a method of processing all parity bits generated by LDPC coding to be transferable is referred to as 'full buffer rate matching (FBRM)', and a method of limiting the number of transmittable parity bits is referred to as 'LBRM (limited buffer rate matching)'.
  • FBRM full buffer rate matching
  • 'LBRM limited buffer rate matching
  • N cb N.
  • N ref TBS LBRM C ⁇ R LBRM ⁇
  • R LBRM may be determined to 2/3. The above-described method of determining the TBS may be used for determining TBS LBRM .
  • the max data rate supported by the terminal may be determined through [Equation 4].
  • J denotes the number of carriers bundled by carrier aggregation (CA)
  • Rmax 948/1024
  • ⁇ Layers j denotes the maximum number of layers of the carrier of an index j
  • Q m j denotes the maximum modulation order of the carrier of an index j
  • f (j) denotes a scaling factor of the carrier of the index j
  • ⁇ denotes subcarrier spacing.
  • f ( j ) is one value of 1, 0.8, 0.75, and 0.4, and may be reported by the terminal, and ⁇ may be given as illustrated in [Table 16].
  • ⁇ ⁇ f 2 ⁇ ⁇ 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal
  • OH (j) is an overhead value, may be given as 0.14 in a downlink and 0.18 in an uplink of FR1 (e.g., bands of 6 GHz or 7.125 GHz or lower), and be given as 0.08 in a downlink and 0.10 in an uplink of FR2 (e.g., bands more than 6 GHz or 7.125 GHz).
  • a max data rate of the downlink may be calculated as illustrated in [Table 17].
  • [Table 17] f (j) ⁇ Layers j Q m j Rmax N PRB BW j , ⁇ T s ⁇ OH (j) data rate 1 4 8 0.92578125 273 3.57143E-05 0.14 2337.0 0.8 4 8 0.92578125 273 3.57143E-05 0.14 1869.6 0.75 4 8 0.92578125 273 3.57143E-05 0.14 1752.8 0.4 4 8 0.92578125 273 3.57143E-05 0.14 934.8
  • an actual data rate that may be measured in actual data transmission of the terminal may be a value obtained by dividing a data amount by a data transmission time. This may be a value obtained by dividing a TB size (TBS) in 1 TB transmission or the sum of TBSs in 2 TB transmission by a TTI length.
  • TBS TB size
  • a maximum actual data rate of the downlink may be determined as illustrated in [Table 18] according to the number of allocated PDSCH symbols.
  • the max data rate supported by the terminal may be identified through [Table 17], and an actual data rate according to the allocated TBS may be identified through [Table 18]. In this case, according to scheduling information, there may be a case where the actual data rate is greater than the max data rate.
  • a data rate that the terminal can support may be mutually agreed between the base station and the terminal. This may be calculated using the maximum frequency band, the maximum modulation order, and the maximum number of layers supported by the terminal.
  • the calculated data rate may be different from a value calculated from a transport block size (TBS) and a transmission time interval (TTI) length used for actual data transmission.
  • TBS transport block size
  • TTI transmission time interval
  • the terminal may receive allocation of a TBS larger than a value corresponding to a data rate supported by itself, and in order to prevent this, there may be restrictions on the TBS that may be scheduled according to the data rate supported by the terminal. It may be necessary to minimize this case and define an operation of the terminal in this case.
  • a TBS LBRM is determined based on the number of layers or ranks supported by the terminal, and the like, but the process is inefficient or the parameter configuration is ambiguous; thus, there is a problem that it is difficult to stably apply LBRM in the base station or the terminal.
  • the disclosure will describe various embodiments for solving these problems.
  • FIG. 11 is a flowchart of a terminal for transmitting or receiving data in a communication system according to various embodiments of the disclosure.
  • FIG. 11 illustrates a method of operating a terminal 120.
  • the terminal receives an indication for LBRM.
  • the indication for LBRM may be included in information for configuring a channel (e.g., PUSCH or PDSCH) used for transmitting or receiving data.
  • information for configuring a channel may be received through an RRC message.
  • LBRM may be enabled by a 'rateMatching' parameter in a PUSCH-ServingCellConfig.
  • the terminal obtains parameters necessary for performing LBRM.
  • Parameters for performing LBRM may include at least one of at least one parameter or code rate for calculating a TB size.
  • the parameter for calculating the TB size may include at least one of a maximum number of layers or a band combination applied to perform CA.
  • the terminal determines a range of transmittable parity bits according to LBRM.
  • LBRM is a technique of treating a part of parity bits as transmittable bits, and transmitting at least one buffer of the transmittable bits through a channel. For example, as illustrated in FIG. 12 , bits within a limited range 1206 indicated by Ncb among parity bits 1204 generated from information bits 1202 are transmittable, and the remaining bits are not transmitted even if a redundancy version (RV) is changed. Accordingly, the terminal may determine which range of parity bits is to be treated as transmittable or receivable bits. Treating the bits as transmittable bits may be accomplished by inputting the bits to a circular buffer.
  • the terminal transmits or receives data according to LBRM.
  • the terminal performs encoding or decoding in consideration of parity bits within a limited range.
  • the terminal may operate a buffer of a size corresponding to a limited range in order to buffer received data.
  • the terminal may generate parity bits by encoding information bits, and include at least one parity bit selected within a limited range among the generated parity bits in the transmission data.
  • the terminal may perform LBRM.
  • the terminal determines a limited range for parity bits. To this end, it is required to determine a parameter (e.g., a band combination or maximum number of layers applied for a CA operation) necessary for determining a limited range.
  • a parameter e.g., a band combination or maximum number of layers applied for a CA operation
  • a TBS LBRM may be determined based on the following configuration.
  • the maximum number X of layers for one TB may be determined as follows including at least two configuration steps in Table 19. [Table 19] Confi gurati on Contents 0 If the higher layer parameters maxMIMO-Layers-BWP of PUSCH-ServingCellConfigBWP of all BWPs of the serving cell are configured, X is given by the maximum value across all the maxMIMO-Layers-BWP values of the serving cells 1 Else if the higher layer parameter maxMIMO-Layers of PUSCH-ServingCellConfig of the serving cell is configured, X is given by that parameter 2 Else if the higher layer parameter maxRank of pusch-Config of the serving cell is configured, X is given by the maximum value of maxRank across all BWPs of the serving cell 3 otherwise, X is given by the maximum number of layers for PUSCH supported by the UE for the serving cell
  • X may be determined as the maximum value among the maximum number of layers. According to another embodiment, X may be determined as a minimum value among the maximum number of layers configured for a plurality of BWPs. According to another embodiment, X may be determined to a value (e.g., a median value, an average value, and the like) determined based on the maximum number of layers configured for the plurality of BWPs.
  • a value e.g., a median value, an average value, and the like
  • X in case that maximum ranks are configured for a plurality of BWPs, X may be determined as the maximum value among the maximum ranks. According to another embodiment, X may be determined as a minimum value among maximum ranks configured for a plurality of BWPs. According to another embodiment, X may be determined as a value (e.g., a median value, an average value, and the like) determined based on the maximum ranks configured for the plurality of BWPs.
  • a configuration 0 and configuration 2 determine X based on all BWPs of the serving cell.
  • X may be determined based on all active BWPs, active BWPs, or all configured BWPs.
  • X may be determined based on a plurality of BWPs satisfying a specific condition.
  • FIG. 13 is a flowchart 1300 of a terminal for determining the maximum number of layers in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 13 illustrates an operation method of the terminal 120.
  • the terminal may receive an indication for PUSCH-LBRM.
  • the terminal may identify whether a parameter maxMIMO-Layer has been configured. If a maxMIMO-Layer has been configured, in step 1305, the terminal may determine X as a value of maxMIMO-Layer. If a maxMIMO-Layer has not been configured, in step 1307, the terminal may identify whether a parameter maxRank has been configured. If a maxRank has been configured, in step 1309, the terminal determines a maximum value of a maxRank for all BWPs of the serving cell to X. If a maxRank has not been configured, in step 1311, the terminal may determine the maximum number of layers for a PUSCH supported by the terminal in the serving cell to X.
  • FIG. 14 is another flowchart 1400 of a terminal for determining the maximum number of layers in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 14 illustrates a method of operating the terminal 120.
  • FIG. 14 illustrates an embodiment except for steps 1303 and 1305 in the embodiment of FIG. 13 .
  • the embodiment of FIG. 14 may be applied in case that a parameter maxMIMO-Layers value included in a PUSCH-ServingCellConfig configured in the base station is the same as a maxRank value included in a pusch-Config.
  • the terminal may receive an indication for PUSCH-LBRM.
  • the terminal may identify whether a parameter maxMIMO-Layers-BWP has been configured.
  • the parameter maxMIMO-Layers-BWP may be configured for each BWP for at least one BWP. If the parameter maxMIMO-Layers-BWP has been configured, in step 1405, the terminal determines X based on maxMIMO-Layers-BWP values for each BWP. For example, X may be determined as any one of a maximum value, a minimum value, an average value, or a median value of maxMIMO-Layers-BWP values.
  • BWPs considered for determining an X value may be all BWPs, activated BWPs, or BWPs satisfying a specific condition.
  • the terminal may identify whether a parameter maxRank has been configured. If a maxRank has been configured, in step 1409, the terminal may determine a maximum value of a maxRank for all BWPs of the serving cell to X. If a maxRank has not been configured, in step 1411, the terminal may determine the maximum number of layers for a PUSCH supported by the terminal in the serving cell to X.
  • the changed configuration may be applied as follows.
  • the maximum number X of layers for one TB may be determined as follows including at least two configuration steps in Table 20. [Table 20] Confi gurati on Contents 0 If the higher layer parameters maxMIMO-Layers-BWP of PUSCH-ServingCellConfigBWP of all BWPs of the serving cell are configured, X is given by the maximum value among maxMIMO-Layers-BWP 1 Else if the higher layer parameter maxRank of pusch-Config of the serving cell is configured, X is given by the maximum value of maxRank across all BWPs of the serving cell 2 otherwise, X is given by the maximum number of layers for PUSCH supported by the UE for the serving cell
  • X may be determined to the maximum value among the maximum number of layers. According to another embodiment, X may be determined to a minimum value among the maximum number of layers configured for a plurality of BWPs. According to another embodiment, X may be determined to a value (e.g., a median value, an average value, and the like) determined based on the maximum number of layers configured for the plurality of BWPs.
  • a value e.g., a median value, an average value, and the like
  • X in case that maximum ranks are configured for a plurality of BWPs, X may be determined as a maximum value among the maximum ranks. According to another embodiment, X may be determined as a minimum value among the maximum ranks configured for a plurality of BWPs. According to another embodiment, X may be determined as a value (e.g., a median value, an average value, and the like) determined based on the maximum ranks configured for a plurality of BWPs.
  • a value e.g., a median value, an average value, and the like
  • a configuration 0 and a configuration 1 of the embodiment of [Table 20] determine X based on all BWPs of the serving cell, but according to the system, X may be used based on all active BWPs or all configured BWPs, or may be used based on a plurality of BWPs satisfying specific conditions.
  • parameters may be configured in consideration of a band combination and a feature set related to at least one serving cell (or at least one configured serving cell). For example, the maximum number of layers may be determined in consideration of a signaled or indicated band combination and function set related to the serving cell. An embodiment for this will be described in the following [Configuration C for Rate Matching Considering PUSCH-LBRM].
  • the maximum number X of layers for one TB is determined as follows including at least two configuration steps in Table 21. [Table 21] Confi gurati on Contents 0 If the higher layer parameter maxMIMO-Layers of PUSCH-ServingCellConfig of the serving cell is configured, X is given by that parameter 1 Else if the higher layer parameter maxRank of pusch-Config of the serving cell is configured, X is given by the maximum value of maxRank across all BWPs of the serving cell 2 otherwise, X is given by the maximum number of layers for PUSCH supported by the UE for any signaled band combination and feature set consistent with the serving cell
  • X may be determined as the largest supported number of layers in consideration of all band combinations.
  • the base station and the terminal or the transmitter and the receiver should maintain the same configuration or promised configuration.
  • various combinations of the components mentioned in the disclosure are possible.
  • the configuration steps included in the configuration methods of Tables 19, 20, and 21 are not necessarily included.
  • the configuration 2 in case that the system does not require a configuration condition related to a maxRank, the configuration 2 may be omitted or replaced with another configuration.
  • the order of configuration steps included in the configuration methods of Tables 19, 20, and 21 may be changed.
  • the configuration of the serving cell is prioritized over the configuration of the BWP of the serving cell, the order may be changed by redefining the configuration 0 and configuration 1 to the configuration 1 and configuration 0, respectively.
  • each of configurations in Tables 19, 20, and 21 may be applied interchangeably. For example, configurations in consideration of the band combination, as in a configuration 2 of Table 21, may be applied to one of the configurations of Table 19 or 20.
  • Various embodiments to be described below relate to efficient downlink LBRM (e.g., PDSCH-LBRM, DL-SCH LBRM, or PCH LBRM) in data transmission.
  • LBRM efficient downlink LBRM
  • the disclosure will describe an embodiment of PDSCH-LBRM, but the described embodiment may also be applied to DL-SCH LBRM or PCH LBRM.
  • a TBS LBRM is determined based on the maximum number of layers of a PUSCH or a PDSCH configured in higher layer signaling (e.g., RRC signaling). However, because the maximum number of layers is not determined until information on UE capability is reported from the UE to the base station, a problem may occur in applying LBRM.
  • RRC signaling e.g., RRC signaling
  • FIG. 15 is a diagram illustrating an example of a section in which ambiguity of parameters required to perform LBRM occurs in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 15 illustrates an example of events occurring in an initial access process of the terminal.
  • an SS/PBCH is detected by the UE at a first time point 1510
  • a RACH procedure is completed at a second time point 1520
  • UE capability information is requested from the base station to the UE at a third time point 1530
  • reporting of UE capability information from the UE to the base station is completed at a fourth time point 1540.
  • a value of the maximum number X of layers may be fix to a predetermined value or integer during the interval 1550 of FIG. 15 .
  • the maximum number of layers for one TB is determined by the minimum of X and 4 calculated including at least two configuration steps in Table 22.
  • Table 22 Confi gurati on Contents 0 If the higher layer parameters maxMIMO-Layers-BWP of PDSCH-ServingCellConfigBWP for all BWPs of the serving cell are configured, X is given by the maximum value across all the maxMIMO-Layers-BWP values of the serving cells.
  • the order of the configuration steps included in the configuration methods of Table 22 may be changed. For example, if the configuration of the serving cell is prioritized over the configuration of the BWP of the serving cell, the order may be changed by redefining configurations 0 and 1 to configurations 1 and 0, respectively. Not only that, to change the configuration order in this way and to omit some configurations or to replace them with other types are also applicable at the same time.
  • X may be configured to an integer different from 1 or may be configured to a different parameter.
  • a process of determining X based on all BWPs of the serving cell in the embodiment of [Table 22] or [Table 23] may be used based on all active BWPs or all configured BWPs according to a system or may be used based on a plurality of BWPs satisfying a specific condition.
  • configurations 2 and 3 of Table 22 in case of not corresponding to configurations 0 and 1, it may be replaced by determining X to the maximum number of layers for PDSCH supported by the UE for the serving cell.
  • a system in which signaling information including maxMIMO-Layers-BWP is PDSCH-ServingCellConfigBWP has been described, but this is only an example of a method of indicating a BWP-specific maxMIMO-Layer value, and a name or parameter of such signaling information may be generally configured to a different name according to a communication system or version information of the system.
  • a configuration 0 of Table 22 is only an embodiment of a method of determining X as the maximum value of all BWP-specific maxMIMO-layers values of the serving cell in case that all BWPs of the serving cell are generally configured to maxMIMO-layers.
  • FIG. 16 is another flowchart 1600 of a terminal for determining the maximum number of layers in a wireless communication system according to various embodiments of the disclosure.
  • FIG. 16 illustrates an operation method of the terminal 120.
  • the UE may receive an indication for PDSCH-LBRM.
  • the UE may identify whether a parameter maxMIMO-Layers-BWP has been configured.
  • the parameter maxMIMO-Layers-BWP may be configured for each BWP for at least one BWP. If a parameter maxMIMO-Layers-BWP has been configured, in step 1605, the UE may determine X based on maxMIMO-Layers-BWP values for each BWP. For example, X may be determined to any one of a maximum value, a minimum value, an average value, and a median value of maxMIMO-Layers-BWP values.
  • the considered BWPs may be all BWPs, activated BWPs, or BWPs satisfying a specific condition.
  • the UE may identify whether a parameter maxMIMO-Layer has been configured. If a maxMIMO-Layer has been configured, in step 1609, the UE may determine X as a value of maxMIMO-Layer. If a maxMIMO-Layer has not been configured, in step 1611, the UE may identify whether a parameter maxNumberMIMO-LayersPDSCH has been configured. If a maxNumberMIMO-LayersPDSCH has been configured, in step 1613, the UE may determine X as a value of maxNumberMIMO-LayersPDSCH. If a maxNumberMIMO-LayersPDSCH has not been configured, in step 1615, the UE may determine X to a predetermined value (e.g., 1).
  • a predetermined value e.g., 1).
  • parameters may be configured in consideration of a band combination and function set related to at least one serving cell (or at least one configured serving cell) for rate matching in consideration of PDSCH-LBRM.
  • the maximum number of layers may be determined in consideration of any signaled or indicated band combination and function set related to the serving cell. An embodiment of this will be described in the following [Configuration B for Rate Matching Considering PDSCH-LBRM].
  • the maximum number of layers for one TB for DL-SCH/PCH is given by the minimum of X and 4, where [Table 24] Confi gurati on Contents 1 If the higher layer parameter maxMIMO-Layers of PDSCH-ServingCellConfig of the serving cell is configured, X is given by that parameter 2 otherwise, X is given by the maximum number of layers for PDSCH supported by the UE for any signaled band combination and feature set consistent with the serving cell
  • X may be determined as the largest supported number of layers in consideration of all band combinations.
  • each of configurations in Tables 22, 23, and 24 may be applied interchangeably.
  • configurations in consideration of the band combination, as in configuration 2 of Table 24 may be applied to one of the configurations of Table 22 or 23.
  • a specific embodiment of the parameter configuration for applying LBRM of the disclosure may be expressed as follows.
  • the maximum number of layers may be determined based on the configured value.
  • the maximum modulation order may be determined based on the configured value. However, in case that corresponding parameters are not configured to higher layer signaling, the maximum modulation order may be configured to a predetermined value or to a value determined according to a predetermined rule.
  • the conditions for the mcs-Table may be modified in various forms.
  • the maximum modulation order may be configured according to whether qam256 has been configured to the mcs-Table.
  • a similar method may be implemented based on a value of a mcs-TableTransformPrecoder instead of the mcs- Table.
  • the base station may perform the same parameter configuration operation as that of the UE, and then perform encoding or decoding.
  • the operation of the base station is similar to the above-described operation of the UE.
  • various combinations of a PUSCH-LBRM operation and a PDSCH-LBRM operation proposed in the disclosure may be applied to the LBRM method of the base station and the UE.
  • LBRM may affect a performance because some of the parity may not be transmitted due to buffer limitations. For this reason, the base station or the UE may configure the MCS so that LBRM is not applied to the maximum or is minimized. For example, after calculating the TBS for each MCS, the base station or the UE may determine whether LBRM is applied in case of scheduling with each MCS, and may not use the MCS to which LBRM is determined to be applied. In other words, the base station or the UE may use one MCS among MCSs to which LBRM is not applied.
  • the base station or the UE may configure a relatively high or highest MCS among MCS to which LBRM is applied as the final MCS.
  • the determination on whether LBRM is applied may be made by comparing the N value and the N ref value for each MCS. For example, if N > N ref , LBRM may be applied, otherwise LBRM may not be applied.
  • a method of controlling the application of LBRM through an MCS configuration may be applied differently according to a stand-alone (SA) operation or a non-stand alone (NSA) operation in a system after 5G.
  • SA stand-alone
  • NSA non-stand alone
  • the application of LBRM is controlled through the MCS configuration, but in case of a communication system or network to which the NSA operation method is applied, the control on whether to apply LBRM through the MCS configuration may not be applied.
  • the application of LBRM is controlled through the MCS configuration, but in case of a communication system or network to which the SA operation method is applied, the control on whether LBRM is applied through the MCS configuration may not be applied.
  • the application of LBRM is controlled through the MCS configuration for all of SA/NSA operation methods, specific rules may be defined differently.
  • the SA operation is a method in which a first cellular network (e.g., legacy network) and a second cellular network (e.g., 5G network) are independently operated
  • the NSA operation is a method in which the first cellular network and the second cellular network are connected to each other and are operated. When two networks are connected and operated, it means that at least one network controls the operation of the other network.
  • a computer readable storage medium storing one or more programs (software modules) may be provided.
  • One or more programs stored in the computer readable storage medium are configured for execution by one or more processors in an electronic device.
  • One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in claims or specifications of the disclosure.
  • Such programs may be stored in a random access memory, a non-volatile memory including a flash memory, a read only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs), other types of optical storage devices, or magnetic cassettes.
  • a non-volatile memory including a flash memory, a read only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs), other types of optical storage devices, or magnetic cassettes.
  • EEPROM electrically erasable programmable ROM
  • CD-ROM compact disc-ROM
  • DVDs digital versatile discs
  • each configuration memory may be included in the plural.
  • the program may be stored in an attachable storage device that may access through a communication network such as Internet, Intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a communication network configured with a combination thereof.
  • a storage device may access to a device implementing an embodiment of the disclosure through an external port.
  • a separate storage device on the communication network may access to the device implementing the embodiment of the disclosure.
  • components included in the disclosure are expressed in the singular or the plural according to the presented specific embodiments.
  • the singular or plural expression is appropriately selected for the presented situation for convenience of description, and the disclosure is not limited to the singular or plural components, and even if the component is expressed in the plural, the component may be configured with the singular, or even if the component is expressed in the singular, the component may be configured with the plural.

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